Thanks! I'll check out our local Wilkinsons (though it isn't the biggest on).
Not sure where the nearest 'real' home brew store might be though. Probably castleford.
Just googled "home brew shops in Yorkshire" and there seem to be a fair few, scattered around. Sheffield, Doncaster, Leeds, Morley, Cleckheaton, York. Have a look and see which is nearest. "Brewpaks" seems to be a common trade name.